Im 15 and i have these weird marks that look like stretch marks on my legs im not fat im a size 6 UK and i don't understand what could they be and how would you get rid of them?

Stretch marks are not only formed from weight gain or pregnancy. So if you haven't gained weight, then I would suggest your stretch marks (especially if they are on your legs) are due to growth spurts (growing taller).

Stretch marks can be caused by:

Weight gain (muscle and fat)

Weight loss

Pregnancy

Puberty

Growth Spurts

Hormones

Certain medications

Certain illnesses

Poor skin elasticity and collegan

Genetics... You can use Cocoa butter, shay butter or bio oil on them (or on any scar) to fade them. I think you can also get lazer surgery on them too. yeah i get the same thing its totally normal it just means you're growing fast